Precipitation on Dislocations in Al-Li-Cu-Mg-Zr

Abstract

Transmission electron microscopy was used to study precipitation processes on dislocation lines in Al-2.5Li-1.3Cu-0.7Mg-0.12Zr wt% aged at 190 C. Upon aging, a series of dislocation dissociation and precipitation reactions occur. The T1-Al2CuLi phase nucleates on dislocations in the (111) glide planes inducing the lattice dislocation to dissociate. On the remaining dislocation segment, S'Al2CuMg plates form causing the lattice dislocation to dissociate into a configuration with a Shockley partial on one side and a climbing partial on the other, such that S plates are on the (210) plane. T1 phases nucleate from the surface of S plates on conjugate (111) with an interfacial dislocation glide motion. (jes)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1990
Accession Number
ADA221124

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  • D. M. Vanderwalker

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